Review on DerBlue Replacement HEPA Filters: Improve Air Quality with AER1 Type Total Air Filter, HAPF30AT for Holmes Purifier HAP242-NUC by Stephanie Rivera

You get what you pay for. You are very thin. Therefore, it must be replaced earlier than the manufacturer's original spare part. And since they're thinner, I'm not sure how well they'll work. Especially since we live in Northern California, an area that has seen several devastating wildfires in the past 4 years. And our air quality has suffered greatly. And we have several air purifiers that are currently running for several weeks. They are easy to install as they have the grommets that the originals have. I have verified that the cheaper replacement parts I ordered are actually there. As I have seen, many did not. And the tongues keep them in place and prevent slipping.